The Paramedic CU-ER2, in automatic mode, is designed to automatically analyze the ECG of the patient. Analysis starts as soon as the ECG pads are properly attached. The user is guided by a combination of text and voice prompts throughout the rescue operation. The ECG of the patient is displayed in a liquid crystal display (LCD).

In manual mode, the Paramedic CU-ER2 has to be operated by personnel trained in advance cardiac life support. The operator should have the skill to interpret ECG rhythms. In this mode, the operator has the freedom to set the energy level of the defibrillating shock. The choices are (in Joules) 2, 3, 5, 7, 10, 20, 30, 50, 70, 100, 150, 200.